CVE-2026-42399

Name: CVE-2026-42399
Creator: NVD / NIST
Published: 2026-05-28T21:16:30.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-42399 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially increasing amounts of memory by submitting a specially crafted Timelion visualization expression containing deeply chained function calls. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially increasing amounts of memory by submitting a specially crafted Timelion visualization expression containing deeply chained function calls. The resulting data structure grows without bound, exhausting available memory and causing the Kibana service to crash and become unavailable to all users.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.30%

21.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Elastic	Kibana	>= 8.0.0, < 8.19.16
Elastic	Kibana	>= 9.0.0, < 9.3.5

References

https://discuss.elastic.co/t/kibana-8-19-16-and-9-3-5-security-update-esa-2026-36/386556Vendor Advisory

Timeline

Published: May 28, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42399?

How severe is CVE-2026-42399?

CVE-2026-42399 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42399?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42399?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST